Revert of Disable flaky ShellApiTest.Basic.

extensions/shell/browser/shell_browsertest.cc

Index: extensions/shell/browser/shell_browsertest.cc
diff --git a/extensions/shell/browser/shell_browsertest.cc b/extensions/shell/browser/shell_browsertest.cc
index 93e6b39d5f84b941e83d51266a4b2785f7538a37..baf75d9f712243084a201aa9655871c52a371e12 100644
--- a/extensions/shell/browser/shell_browsertest.cc
+++ b/extensions/shell/browser/shell_browsertest.cc
@@ -17,14 +17,8 @@
 
 namespace extensions {
 
-// Flaky on linux. See http://crbug.com/470873.
-#if defined(OS_LINUX)
-#define MAYBE_Basic DISABLED_Basic
-#else
-#define MAYBE_Basic Basic
-#endif
 // Test that we can open an app window and wait for it to load.
-IN_PROC_BROWSER_TEST_F(ShellApiTest, MAYBE_Basic) {
+IN_PROC_BROWSER_TEST_F(ShellApiTest, Basic) {
   ASSERT_TRUE(RunAppTest("platform_app")) << message_;
 
   // A window was created.